Question

What is the inherent weakness of all wind machines?

(a) Their efficiencies

(b) Requires powerful winds to make fan rotate

(c) Their dependency on the wind speed

(d) Cannot be easily repaired

I got this question in examination.

The query is from Wind Turbine Operation topic in chapter Wind Energy of Energy Engineering

Answer 1

The correct answer is (c) Their dependency on the wind speed

The explanation: An inherent weakness of all wind machines are the strong dependence of the power produced on wheel diameter and wind speed, being proportional to turbine wheel area, i.e. to the square of its diameter and to the cube of wind velocity.